Hajji, A. M., A. Larasati, and M. P. Lewis. “Combining Off-the-Job Productivity Regression Model With EPA’s NONROAD Model in Estimating CO2 Emissions from Bulldozer”. Civil Engineering Dimension, vol. 19, no. 2, Sept. 2017, pp. 73-78, doi:10.9744/ced.19.2.73-78.